Verbal Negation in Diachrony of Portuguese: Variation with Stability

Our goal is to prove the stability of negation in the Portuguese history. We propose get the fact that negation and verb always occur amalgamed in Portuguese, and we also explain why negation has never been a context of XPs' interpolation, otherwise the other proclitic adverbials, but it was the greater interpolated element. We argue that these facts derive from an statute of clitic to negation. But, on the contary of the pronominal clitics, there wasn't any change about negation operator -- 'nao' -- on the History of Portuguese. The analysis in the Distributed Morphology Theory foresees that the incorporation of I(degrees) to S-Neg(degrees) is obligatory. Adapted from the source document